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@einen tetr etrnt @ffice FREDERIC MANSFIELD, QF FITCHBURG, MASSACHUSETTS, ASSIGNOR TO HIMSELF AND H. C. HITCHCOCK, OF SAME PLACE.

Lam Pfam No. 78,750, ma Jimi 9, 186e.

IMPROVEMENT IN' SAW-HORSES.

TO ALL WHOM IT MAY CONCERN:

Be it known ythat I, FREDERIC W. MANSFXELD, of Fitchbnrg, in the county of Worcester, and State of Massachusetts, .have invented a new and improved Clamp-.Attachment to Saw-Horses, 8m.; and I do hereby declare that the following is a. full, clear, andexact description thereof, which will enable those skilled in the art to make and use the same, reference being had to .the accompanying drawings, forming part of this specification,

This invention relates to a new and improved' method of constructing portable'clamps` for holding wood tirmlly upona saw-horse or bench, whereby wood may be sawed or cut with less fatigue to the operator.

The drawing representsra central vertical section of my invention attached to .a saw-horse.

The clamp is composed of two bent metallic levers, A and C, upon each side of a'saw-ho'rse, D,as` shown in the drawing. l i l The levers A are bent in the form as shown in the drawing, the longer arms of the same being joined together by a rod, e, within convenient reach of the foot of the operator.

The shorter arms of the levers A are so formedor weighted as to be heavier than the longer' arms ofthe same.` i y Upon the back side of each of said levers A is a projection, a, which, together with the longer arms of said levers-A, 'form crotchcs, by means of which saidlevers A areheld upon the cross-round B of any 'saw-horse, D, the said round, B, serving as the fulcrum of the levers A.

The levers C are pivoted to the top and front of the'saw-horse D, one upon each side, are bent in the't'orm as shown, and are furnished at the lower end ofthe same with the projection a', the projection. a on one ofthe levers C facing towards theprojection a on theother lever C.

Upon the projection a the longer arms of the levers A rest, as shown, in such a manner that by forcing the longer arm'of the levers A downward and backward with the foot, the faces of the short arms ofthe levers `A, and the faces of thelevers C, will approach each other.

The inner edges of the levers A and C, above the round, B, are corrugated or formed with teeth, as shown in the drawing.

The levers C are pivoted to the upper end and front of the saw-horse D, as shown, by projections formedI upon the same, in `such a manner that said levers C may be easily atany time removed.

rllhe operation is such, that by placing the'wood upon the saw-'horse D, so furnished with a clamp as above described, by the operator pressing with thc foot upon the rod e, the toothed jaws formed by the levers A and C will fasten upon and hold the wood firmly upon the horse D, said jaws opening by their own weight when the foot of the operator is removed.

I claiml as new, and desire to secure by Letters Patent* v Theconstruction of the curved serrated levers A C, composing/thc clampattachment, when arranged and1 adapted to be applied to a. sawhorse, in the manner and for thepurpose hereinshown anddescribed.

- FREDERIC W. MANsFIELD.

Witnesses:

' C. H. DAMON,

DAVID Wl'rnnnnn 

